Stock-Based Compensation Outstanding Options and SSARs (Details) (USD $) In Millions, except Share data, unless otherwise specified	9 Months Ended
	Sep. 30, 2012 years	Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]
Options / SSARs outstanding at January 1, 2012	8,315,000
Incentive shares granted	971,000
Options / SSARs exercised	(401,000)
Options / SSARs cancelled	(51,000)
Options / SSARs outstanding at September 30, 2012	8,834,000
Options / SSARs outstanding Weighted Average Exercise Price	$ 12.64	$ 12.78
SSARs granted Weighted Average Exercise Price	$ 8.86
Options / SSARs exercised Weighted Average Exercise Price	$ 5.85
Options / SSARs cancelled Weighted Average Exercise Price	$ 16.84
Options / SSARs outstanding Weighted Average Contractual Term (in years)	6.0
Options / SSARs outstanding Aggregate Intrinsic Value (in millions)	$ 28.8
Vested and expected to vest	8,392,000
Vested and expected to vest Aggregate Intrinsic Value (in millions)	27.3
Options / SSARs exercisable	6,954,000
Options / SSARs exercisable Weighted Average Exercise Price	$ 13.67
Options / SSARs exercisable Aggregate Intrinsic Value (in millions)	21.9
Director [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]
Starting Term When Options Become Exercisable After Grant Date	3 months
Stock Options [Member] | Director [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]
Number of months for options to vest at an incremental rate of ten percent for directors	3 months
Options and SSARs [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]
Weighted-average period of years costs are expected to be recognied over	1.7
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost	2.8
Unrecognized compensation costs	$ 4.7
Shares available under stock award plans	3,000,000
Stock Appreciation Rights (SARs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]
Years SSARs become ratably exercisable over	3 years
Years until SSARs expire	P10Y